Organic light emitting diode and organic light emitting device including the same

ABSTRACT

An organic light emitting diode includes a first electrode; a second electrode facing the first electrode; a first emitting material layer between the first and second electrodes; and a first intermediate organic layer between the first emitting material layer and the second electrode and including a first organic layer and a second organic layer between the first organic layer and the second electrode, wherein the first organic layer includes a first compound represented by Formula.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of and the priority to KoreanPatent Application No. 10-2021-0178382 filed in the Republic of Korea onDec. 14, 2021, which is hereby incorporated by reference in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to an organic light emitting diode, andmore particularly, to an organic light emitting diode having low drivingvoltage, high emitting efficiency and long lifespan and an organic lightemitting device including the organic light emitting diode.

Discussion of the Related Art

Recently, requirement for flat panel display devices having smalloccupied area is increased. Among the flat panel display devices, atechnology of an organic light emitting display device, which includesan organic light emitting diode (OLED) and may be called to as anorganic electroluminescent device, is rapidly developed.

The OLED emits light by injecting electrons from a cathode as anelectron injection electrode and holes from an anode as a hole injectionelectrode into an emitting material layer, combining the electrons withthe holes, generating an exciton, and transforming the exciton from anexcited state to a ground state.

The related art OLED has problem of increase of power consumption anddecrease of lifespan by high driving voltage.

SUMMARY

Accordingly, embodiments of the present disclosure are directed to anOLED and an organic light emitting device that substantially obviate oneor more of the problems associated with the limitations anddisadvantages of the related art.

An object of the present disclosure is to provide an OLED and an organiclight emitting device having low driving voltage, high emittingefficiency and long lifespan.

Additional features and aspects will be set forth in the descriptionthat follows, and in part will be apparent from the description, or maybe learned by practice of the present disclosure concepts providedherein. Other features and aspects of the present disclosure conceptsmay be realized and attained by the structure particularly pointed outin the written description, or derivable therefrom, and the claimshereof as well as the appended drawings.

To achieve these and other advantages and in accordance with objects ofthe disclosure, as described herein, an aspect of the present disclosureis an organic light emitting diode including a first electrode; a secondelectrode facing the first electrode; a first emitting material layerbetween the first and second electrodes; and a first intermediateorganic layer between the first emitting material layer and the secondelectrode and including a first organic layer and a second organic layerbetween the first organic layer and the second electrode, wherein thefirst organic layer includes a first compound represented by Formula1-1:

wherein each of Ar1 and Ar2 is independently selected form the groupconsisting of a substituted or unsubstituted C6 to C50 aryl group and asubstituted or unsubstituted C5 to C50 heteroaryl group, and whereineach of R1 to R6 is independently selected form the group consisting ofhydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkylgroup, a substituted or unsubstituted C6 to C30 aryl group and asubstituted or unsubstituted heteroaryl group.

In another aspect of the present disclosure, an organic light emittingdevice includes a substrate; and an organic light emitting diodepositioned over the substrate, the organic light emitting diodeincluding: a first electrode; a second electrode facing the firstelectrode; a first emitting material layer between the first and secondelectrodes; and a first intermediate organic layer between the firstemitting material layer and the second electrode and including a firstorganic layer and a second organic layer between the first organic layerand the second electrode, wherein the first organic layer includes afirst compound represented by Formula 1-1:

wherein each of Ar1 and Ar2 is independently selected form the groupconsisting of a substituted or unsubstituted C6 to C50 aryl group and asubstituted or unsubstituted C5 to C50 heteroaryl group, and whereineach of R1 to R6 is independently selected form the group consisting ofhydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkylgroup, a substituted or unsubstituted C6 to C30 aryl group and asubstituted or unsubstituted heteroaryl group.

It is to be understood that both the foregoing general description andthe following detailed description of the present disclosure are merelyby way of example and are intended to provide further explanation of theinventive concepts as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the present disclosure and are incorporated in andconstitute a part of this application, illustrate embodiments of thepresent disclosure and together with the description serve to explainprinciples of the present disclosure.

FIG. 1 is a schematic circuit diagram of an organic light emittingdisplay device of the present disclosure.

FIG. 2 is a schematic cross-sectional view of an organic light emittingdisplay device according to a first embodiment of the presentdisclosure.

FIG. 3 is a schematic cross-sectional view of an OLED according to asecond embodiment of the present disclosure.

FIG. 4 is a schematic cross-sectional view of an OLED according to athird embodiment of the present disclosure.

FIG. 5 is a schematic cross-sectional view of an organic light emittingdisplay device according to a fourth embodiment of the presentdisclosure.

FIG. 6 is a schematic cross-sectional view of an OLED according to afifth embodiment of the present disclosure.

FIG. 7 is a schematic cross-sectional view of an OLED according to asixth embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to some of the examples andembodiments of the disclosure illustrated in the accompanying drawings.Wherever possible, the same reference numbers will be used throughoutthe drawings to refer to the same or like parts.

The present disclosure provides an OLED and an organic light emittingdevice. For example, the organic light emitting device may be an organiclight emitting display device or an organic light emitting lightingdevice. The explanation below is focused on the organic light emittingdisplay device including the OLED.

FIG. 1 is a schematic circuit diagram of an organic light emittingdisplay device of the present disclosure.

As shown in FIG. 1 , an organic light emitting display device includes agate line GL, a data line DL, a power line PL, a switching thin filmtransistor TFT Ts, a driving TFT Td, a storage capacitor Cst, and anOLED D. The gate line GL and the data line DL cross each other to definea pixel region P. The pixel region may include a red pixel region, agreen pixel region and a blue pixel region.

The switching TFT Ts is connected to the gate line GL and the data lineDL, and the driving TFT Td and the storage capacitor Cst are connectedto the switching TFT Ts and the power line PL. The OLED D is connectedto the driving TFT Td.

In the organic light emitting display device, when the switching TFT Tsis turned on by a gate signal applied through the gate line GL, a datasignal from the data line DL is applied to the gate electrode of thedriving TFT Td and an electrode of the storage capacitor Cst.

When the driving TFT Td is turned on by the data signal, an electriccurrent is supplied to the OLED D from the power line PL. As a result,the OLED D emits light. In this case, when the driving TFT Td is turnedon, a level of an electric current applied from the power line PL to theOLED D is determined such that the OLED D can produce a gray scale.

The storage capacitor Cst serves to maintain the voltage of the gateelectrode of the driving TFT Td when the switching TFT Ts is turned off.Accordingly, even if the switching TFT Ts is turned off, a level of anelectric current applied from the power line PL to the OLED D ismaintained to next frame.

As a result, the organic light emitting display device displays adesired image.

FIG. 2 is a schematic cross-sectional view of an organic light emittingdisplay device according to a first embodiment of the presentdisclosure.

As shown in FIG. 2 , the organic light emitting display device 100includes a substrate 110, a TFT Tr on or over the substrate 110, aplanarization layer 150 covering the TFT Tr and an OLED D on theplanarization layer 150 and connected to the TFT Tr.

The substrate 110 may be a glass substrate or a flexible substrate. Forexample, the flexible substrate may be one of a polyimide (PI)substrate, a polyethersulfone (PES) substrate, a polyethylenenaphthalate(PEN) substrate, a polyethylene terephthalate (PET) substrate and apolycarbonate (PC) substrate.

A buffer layer 122 is formed on the substrate, and the TFT Tr is formedon the buffer layer 122. The buffer layer 122 may be omitted. Forexample, the buffer layer 122 may be formed of an inorganic insulatingmaterial, e.g., silicon oxide or silicon nitride.

A semiconductor layer 120 is formed on the buffer layer 122. Thesemiconductor layer 120 may include an oxide semiconductor material orpolycrystalline silicon.

When the semiconductor layer 120 includes the oxide semiconductormaterial, a light-shielding pattern (not shown) may be formed under thesemiconductor layer 120. The light to the semiconductor layer 120 isshielded or blocked by the light-shielding pattern such that thermaldegradation of the semiconductor layer 120 can be prevented. On theother hand, when the semiconductor layer 120 includes polycrystallinesilicon, impurities may be doped into both sides of the semiconductorlayer 120.

A gate insulating layer 124 of an insulating material is formed on thesemiconductor layer 120. The gate insulating layer 124 may be formed ofan inorganic insulating material such as silicon oxide or siliconnitride.

A gate electrode 130, which is formed of a conductive material, e.g.,metal, is formed on the gate insulating layer 124 to correspond to acenter of the semiconductor layer 120. In FIG. 2 , the gate insulatinglayer 124 is formed on an entire surface of the substrate 110.Alternatively, the gate insulating layer 124 may be patterned to havethe same shape as the gate electrode 130.

An interlayer insulating layer 132 of an insulating material is formedon the gate electrode 130 and over an entire surface of the substrate110. The interlayer insulating layer 132 may be formed of an inorganicinsulating material, e.g., silicon oxide or silicon nitride, or anorganic insulating material, e.g., benzocyclobutene or photo-acryl.

The interlayer insulating layer 132 includes first and second contactholes 134 and 136 exposing both sides of the semiconductor layer 120.The first and second contact holes 134 and 136 are positioned at bothsides of the gate electrode 130 to be spaced apart from the gateelectrode 130.

The first and second contact holes 134 and 136 are formed through thegate insulating layer 124. Alternatively, when the gate insulating layer124 is patterned to have the same shape as the gate electrode 130, thefirst and second contact holes 134 and 136 is formed only through theinterlayer insulating layer 132.

A source electrode 144 and a drain electrode 146, which are formed of aconductive material, e.g., metal, are formed on the interlayerinsulating layer 132.

The source electrode 144 and the drain electrode 146 are spaced apartfrom each other with respect to the gate electrode 130 and respectivelycontact both sides of the semiconductor layer 120 through the first andsecond contact holes 134 and 136.

The semiconductor layer 120, the gate electrode 130, the sourceelectrode 144 and the drain electrode 146 constitute the TFT Tr. The TFTTr serves as a driving element. Namely, the TFT Tr is the driving TFT Td(of FIG. 1 ).

In the TFT Tr, the gate electrode 130, the source electrode 144, and thedrain electrode 146 are positioned over the semiconductor layer 120.Namely, the TFT Tr has a coplanar structure.

Alternatively, in the TFT Tr, the gate electrode may be positioned underthe semiconductor layer, and the source and drain electrodes may bepositioned over the semiconductor layer such that the TFT Tr may have aninverted staggered structure. In this instance, the semiconductor layermay include amorphous silicon.

Although not shown, the gate line and the data line cross each other todefine the pixel region, and the switching TFT is formed to be connectedto the gate and data lines. The switching TFT is connected to the TFT Tras the driving element. In addition, the power line, which may be formedto be parallel to and spaced apart from one of the gate and data lines,and the storage capacitor for maintaining the voltage of the gateelectrode of the TFT Tr in one frame may be further formed.

A planarization layer 150 is formed on an entire surface of thesubstrate 110 to cover the source and drain electrodes 144 and 146. Theplanarization layer 150 provides a flat top surface and has a draincontact hole 152 exposing the drain electrode 146 of the TFT Tr.

The OLED D is disposed on the planarization layer 150 and includes afirst electrode 210, which is connected to the drain electrode 146 ofthe TFT Tr, an light emitting layer 220 and a second electrode 230. Thelight emitting layer 220 and the second electrode 230 are sequentiallystacked on the first electrode 210. The OLED D is positioned in each ofred, green and blue pixel regions and respectively emits the red, greenand blue light.

The first electrode 210 is separately formed in each pixel region. Thefirst electrode 210 may be an anode and may include a transparentconductive oxide material layer, which may be formed of a conductivematerial, e.g., a transparent conductive oxide (TCO), having arelatively high work function. For example, the first electrode 210 maybe formed of one of indium-tin-oxide (ITO), indium-zinc-oxide (IZO),indium-tin-zinc-oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO),indium-copper-oxide (ICO) and aluminum-zinc-oxide (Al:ZnO, AZO).

When the organic light emitting display device 100 is operated in abottom-emission type, the first electrode 210 may have a single-layeredstructure of the transparent conductive oxide material layer. When theorganic light emitting display device 100 is operated in a top-emissiontype, the first electrode 210 may further include a reflection electrodeor a reflection layer. For example, the reflection electrode or thereflection layer may be formed of silver (Ag) oraluminum-palladium-copper (APC) alloy. In the top-emission type organiclight emitting display device 100, the first electrode 210 may have atriple-layered structure of ITO/Ag/ITO or ITO/APC/ITO.

In addition, a bank layer 160 is formed on the planarization layer 150to cover an edge of the first electrode 210. Namely, the bank layer 160is positioned at a boundary of the pixel region and exposes a center ofthe first electrode 210 in the pixel region.

The light emitting layer 220 as an emitting unit is formed on the firstelectrode 210. The light emitting layer 220 includes an emittingmaterial layer (EML) and an intermediate organic layer. For example, theintermediate organic layer may has a double-layered structure includinga first organic layer being a hole blocking layer (HBL) and a secondorganic layer being an electron transporting layer (ETL). In addition,the light emitting layer 220 may further include at least one of a holeinjection layer (HIL), a hole transporting layer (HTL), an electronblocking layer (EBL) and an electron injection layer (EIL). Moreover,two or more light emitting layers may be disposed to be spaced apartfrom each other so that the OLED D may have a tandem structure.

The second electrode 230 is formed over the substrate 110 where thelight emitting layer 220 is formed. The second electrode 230 covers anentire surface of the display area and may be formed of a conductivematerial having a relatively low work function to serve as a cathode.For example, the second electrode 230 may be formed of aluminum (Al),magnesium (Mg), calcium (Ca), silver (Ag) or their alloy, e.g., Mg—Agalloy (MgAg). In the top-emission type organic light emitting displaydevice 100, the second electrode 230 may have a thin profile to betransparent (or semi-transparent).

Although not shown, the organic light emitting display device 100 mayfurther include a color filter. In the bottom-emission type organiclight emitting display device 100, the color filter may be positionedbetween the OLED D and the substrate 110, e.g., between the interlayerinsulating layer 132 and the planarization layer 150. Alternatively, inthe top-emission type organic light emitting display device 100, thecolor filter may be positioned on or over the second electrode 230 ofthe OLED D.

An encapsulation film (or an encapsulation layer) 170 is formed on thesecond electrode 230 to prevent penetration of moisture into the OLED D.The encapsulation film 170 includes a first inorganic insulating layer172, an organic insulating layer 174 and a second inorganic insulatinglayer 176 sequentially stacked, but it is not limited thereto.

The organic light emitting display device 100 may further include apolarization plate (not shown) for reducing an ambient light reflection.For example, the polarization plate may be a circular polarizationplate. In the bottom-emission type organic light emitting display device100, the polarization plate may be disposed under the substrate 110. Inthe top-emission type organic light emitting display device 100, thepolarization plate may be disposed on or over the encapsulation film170.

In addition, in the top-emission type organic light emitting displaydevice 100, a cover window (not shown) may be attached to theencapsulation film 170 or the polarization plate. In this instance, thesubstrate 110 and the cover window have a flexible property such that aflexible organic light emitting display device may be provided.

FIG. 3 is a schematic cross-sectional view of an OLED according to asecond embodiment of the present disclosure.

As shown in FIG. 3 , an OLED D1 includes a first electrode 210, a secondelectrode 230 facing the first electrode 210 and a light emitting layer220 therebetween. The light emitting layer 220 includes an EML 240 andan intermediate organic layer 260 between the EML 240 and the secondelectrode 230. The intermediate organic layer 260 includes a firstorganic layer 270 and a second organic layer 280. The organic lightemitting display device 100 (of FIG. 2 ) includes a red pixel region, agreen pixel region and a blue pixel region, and the OLED D1 ispositioned in each of the red, green and blue pixel regions.

The first electrode 210 may be an anode, and the second electrode 230may be a cathode. One of the first and second electrodes 210 and 230 isa transparent electrode (semitransparent electrode), and the other oneof the first and second electrodes 210 and 230 is a reflectiveelectrode.

The light emitting layer 220 may further include at least one of an HTL250 between the first electrode 210 and the EML 240 and an EBL 255between the HTL 250 and the EML 240.

The light emitting layer 220 may further include at least one of an HIL245 between the first electrode 210 and the HTL 250 and an EIL 290between the second organic layer 280 of the intermediate organic layer260 and the second electrode 230.

The HTL 250 may include at least one of the compounds selected from thegroup consisting ofN,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD),N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB orNPD), 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP),poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)-benzidine] (Poly-TPD),poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine))](TFB), di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC),3,5-di(9H-carbazol-9-yl)-N,N-diphenylaniline (DCDPA),N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amineandN-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine,but it is not limited thereto. For example, the HTL 250 may have athickness of 500 to 1500 Å.

The HIL 245 may include at least one of the compounds selected from thegroup consisting of 4,4′,4″-tris(3-methylphenylamino)triphenylamine(MTDATA), 4,4′,4″-tris(N,N-diphenyl-amino)triphenylamine (NATA),4,4′,4″-tris(N-(naphthalene-1-yl)-N-phenyl-amino)triphenylamine(1T-NATA),4,4′,4″-tris(N-(naphthalene-2-yl)-N-phenyl-amino)triphenylamine(2T-NATA), copper phthalocyanine (CuPc),tris(4-carbazoyl-9-yl-phenyl)amine (TCTA), NPB (or NPD),1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile(dipyrazino[2,3-f:2′3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN),1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB),poly(3,4-ethylenedioxythiphene)polystyrene sulfonate (PEDOT/PSS) andN-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine,but it is not limited thereto. Alternatively, the HIL 245 may include amaterial of the HTL 250 and a p-type dopant such as HAT-CN in Formula4-1. The HIL 245 may have a thickness of 50 to 150 Å.

The EBL 255 may include at least one of compounds selected from thegroup consisting of TCTA, tris[4-(diethylamino)phenyl]amine,N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine,TAPC, MTDATA, 1,3-bis(carbazol-9-yl)benzene (mCP),3,3′-bis(N-carbazolyl)-1,1′-biphenyl (mCBP), CuPc,N,N′-bis[4-[bis(3-methylphenyl)amino]phenyl]-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine(DNTPD), TDAPB, DCDPA,2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene and a compoundin Formula 4-3, but it is not limited thereto. The EBL 255 may have athickness of 100 to 200K.

The EIL 290 may include Yb, LiF, CsF, NaF, BaF₂, or their alloy. The EIL290 may have a thickness of 1 to 20K.

The OLED D1 may further include a capping layer (not shown) under thefirst electrode 210 or on the second electrode 230. The capping layermay include an anthracene derivative (compound) and may have a thicknessof 500 to 800K. For example, the anthracene derivative of the cappinglayer may be a compound in Formula 4-6.

The EML 240 includes a host and a dopant (emitter). The EML 240 in thered pixel region includes a first host and a red dopant, the EML 240 inthe green pixel region includes a second host and a green dopant, andthe EML 240 in the blue pixel region includes a third host and a bluedopant. Each of the red, green and blue dopants may be at least one of aphosphorescent compound, a fluorescent compound and a delayedfluorescent compound. The EML 240 may have a thickness of 200 to 300K.

Each of the first and second hosts may be independently selected fromthe group consisting of 9,9′-diphenyl-9H,9′ H-3,3′-bicarbazole (BCzPh),CBP, 1,3,5-tris(carbazole-9-yl)benzene (TCP), TCTA,4,4′-bis(carbazole-9-yl)-2,2′-dimethylbiphenyl (CDBP),2,7-bis(carbazole-9-yl)-9,9-dimethylfluorene (DMFL-CBP),2,2′,7,7′-tetrakis(carbazole-9-yl)-9,9-spiorofluorene (Spiro-CBP),DPEPO, 4′-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (PCzB-2CN),3′-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (mCzB-2CN),3,6-bis(carbazole-9-yl)-9-(2-ethyl-hexyl)-9H-carbazole (TCzl),bis(2-hydroxylphenyl)-pyridine)beryllium (Bepp₂),bis(10-hydroxylbenzo[h] quinolinato)beryllium (Bebg₂) and1,3,5-tris(1-pyrenyl)benzene (TPB₃).

The red dopant may be selected from the group consisting of[bis(2-(4,6-dimethyl)phenylquinoline)](2,2,6,6-tetramethylheptane-3,5-dionate)iridium(III),bis[2-(4-n-hexylphenyl)quinoline](acetylacetonate)iridium(III)(Hex-Ir(phq)₂(acac)), tris[2-(4-n-hexylphenyl)quinoline]iridium(III)(Hex-Ir(phq)₃), tris[2-phenyl-4-methylquinoline]iridium(III)(Ir(Mphq)₃),bis(2-phenylquinoline)(2,2,6,6-tetramethylheptene-3,5-dionate)iridium(III)(Ir(dpm)PQ₂),bis(phenylisoquinoline)(2,2,6,6-tetramethylheptene-3,5-dionate)iridium(III)(Ir(dpm)(piq)₂),bis[(4-n-hexylphenyl)isoquinoline](acetylacetonate)iridium(III)(Hex-Ir(piq)₂(acac)), tris[2-(4-n-hexylphenyl)quinoline]iridium(III)(Hex-Ir(piq)₃), tris(2-(3-methylphenyl)-7-methyl-quinolato)iridium(Ir(dmpq)₃),bis[2-(2-methylphenyl)-7-methyl-quinoline](acetylacetonate)iridium(III)(Ir(dmpq)₂(acac)) andbis[2-(3,5-dimethylphenyl)-4-methyl-quinoline](acetylacetonate)iridium(III)(Ir(mphmq)₂(acac)).

The green dopant may be selected from the group consisting of[Bis(2-phenylpyridine)](pyridyl-2-benzofuro[2,3-b]pyridine)iridium,fac-tris(2-phenylpyridine)iridium(III) (fac-Ir(ppy)₃),bis(2-phenylpyridine)(acetylacetonate)iridium(III) (Ir(ppy)₂(acac)),tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)₃),bis(2-(naphthalene-2-yl)pyridine)(acetylacetonate)iridium(III)(Ir(npy)₂acac), tris(2-phenyl-3-methyl-pyridine)iridium (Ir(3mppy)₃) andfac-tris(2-(3-p-xylyl)phenyl)pyridine iridium(III) (TEG).

The third host may be selected from the group consisting of mCP,9-(3-(9H-carbazol-9-yl)phenyl)-9H-carbazole-3-carbonitrile (mCP-CN),mCBP, CBP-CN,9-(3-(9H-carbazol-9-yl)phenyl)-3-(diphenylphosphoryl)-9H-carbazole(mCPPO1), 3,5-di(9H-carbazol-9-yl)biphenyl (Ph-mCP), TSPO1,9-(3′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-9H-pyrido[2,3-b]indole(CzBPCb), bis(2-methylphenyl)diphenylsilane (UGH-1),1,4-bis(triphenylsilyl)benzene (UGH-2), 1,3-bis(triphenylsilyl)benzene(UGH-3), 9,9-spiorobifluoren-2-yl-diphenyl-phosphine oxide (SPPO1),9,9′-(5-(triphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (SimCP) and ananthracene derivative, e.g., a compound in Formula 4-4. In addition, theblue dopant may be selected from the group consisting of perylene,4,4′-bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi),4-(di-p-tolylamino)-4-4′-[(di-p-tolylamino)styryl]stilbene (DPAVB),4,4′-bis[4-(diphenylamino)styryl]biphenyl (BDAVBi),2,7-bis(4-diphenylamino)styryl-9,9-spiorfluorene (spiro-DPVBi),[1,4-bis[2-[4-[N,N-di(p-tolyl)amino]phenyl]vinyl] benzene (DSB),1-4-di-[4-(N,N-diphenyl)amino]styryl-benzene (DSA),2,5,8,11-tetra-tetr-butylperylene (TBPe),bis(2-hydroxylphenyl-pyridine)beryllium (Bepp₂),9-(9-phenylcarbazole-3-yl)-10-(naphthalene-1-yl)anthracene (PCAN),mer-tris(1-phenyl-3-methylimidazolin-2-ylidene-C,C(2)′iridium(III)(mer-Ir(pmi)₃),fac-tris(1,3-diphenyl-benzimidazolin-2-ylidene-C,C(2)′iridium(III)(fac-Ir(dpbic)₃),bis(3,4,5-trifluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III)(Ir(tfpd)₂pic), tris(2-(4,6-difluorophenyl)pyridine)iridium(III)(Ir(Fppy)₃),bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III)(FIrpic) and a pyrene derivative, e.g., a compound in Formula 4-5.

In the intermediate organic layer 260, the first organic layer 270 ispositioned between the EML 240 and the EIL 290 or between the EML 240and the second electrode 230, and the second organic layer 280 ispositioned between the first organic layer 270 and the EIL 290 orbetween the first organic layer 270 and the second electrode 230. Thefirst and second organic layers 270 and 280 contact each other.

For example, the first organic layer 270 may be an HBL, and the secondorganic layer 280 may be an ETL.

The intermediate organic layer 260 includes a first compound 272 havinga structure in which a pyrimidine moiety and a quinoline moiety directlylinked (connected, combined or joined) to each other. For example, thefirst organic layer 270 includes the first compound 272. The firstcompound 272 is represented by Formula 1-1.

In Formula 1-1, each of Ar1 and Ar2 is independently selected from thegroup consisting of a substituted or unsubstituted C6 to C50 aryl groupand a substituted or unsubstituted C5 to C50 heteroaryl group. Each ofR1 to R6 is independently selected form the group consisting ofhydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkylgroup, a substituted or unsubstituted C6 to C30 aryl group and asubstituted or unsubstituted C5 to C30 heteroaryl group.

In the present disclosure, without specific definition, the C6 to C50aryl group and/or C6 to C30 aryl group may be selected from the groupconsisting of phenyl, biphenyl, terphenyl, naphthyl, anthracenyl,pentanenyl, indenyl, indenoindenyl, heptalenyl, biphenylenyl, indacenyl,phenanthrenyl, benzophenanthrenyl, dibenzophenanthrenyl, azulenyl,pyrenyl, fluoranthenyl, triphenylenyl, chrysenyl, tetraphenyl,tetracenyl, picenyl, pentaphenyl, pentacenyl, fluorenyl, indenofluorenyland spiro-fluorenyl.

In the present disclosure, without specific definition, the C5 to C50heteroaryl group and/or the C5 to C30 heteroaryl group may be selectedfrom the group consisting of pyrrolyl, pyridinyl, pyrimidinyl,pyrazinyl, pyridazinyl, triazinyl, tetrazinyl, imidazolyl, pyrazolyl,indolyl, isoindolyl, indazolyl, indolizinyl, pyrrolizinyl, carbazolyl,benzocarbazolyl, dibenzocarbazolyl, indolocarbazolyl, indenocarbazolyl,benzofurocarbazolyl, benzothienocarbazolyl, quinolinyl, isoquinolinyl,phthalazinyl, quinoxalinyl, cinnolinyl, quinazolinyl, quinozolinyl,purinyl, benzoquinolinyl, benzoisoquinolinyl, benzoquinazolinyl,benzoquinoxalinyl, acridinyl, phenanthrolinyl, perimidinyl,phenanthridinyl, pteridinyl, naphtharidinyl, furanyl, oxazinyl,oxazolyl, oxadiazolyl, triazolyl, dioxynyl, benzofuranyl,dibenzofuranyl, thiopyranyl, xanthenyl, chromanyl, isochromanyl,thioazinyl, thiophenyl, benzothiophenyl, dibenzothiophenyl,difuropyrazinyl, benzofurodibenzofuranyl, benzothienobenzothiophenyl,benzothienodibenzothiophenyl, benzothienobenzofuranyl, andbenzothienodibenzofuranyl.

In the present disclosure, without specific definition, a substituent ofan alkyl group, an aryl group and/or a heteroaryl group may be at leastone of deuterium, tritium, halogen, cyano, a C1 to C20 alkyl group, arylphosphine oxide, a substituted or unsubstituted C6 to C30 aryl group anda substituted or unsubstituted C5 to C30 heteroaryl group.

For example, in Formula 1-1, one of Ar1 and Ar2 may be a C6 to C50 arylgroup, e.g., phenyl, unsubstituted or substituted with a C1 to C20 alkylgroup, e.g., tert-butyl, and the other one of Ar1 and Ar2 may be C6 toC50 aryl group, e.g., phenyl, naphthyl, biphenyl, fluorenyl,unsubstituted or substituted with at least one of a substituted orunsubstituted C6 to C30 aryl group or a substituted or unsubstituted C5to C30 heteroaryl group.

The first compound 272 may be one of the compounds in Formula 1-2.

The intermediate organic layer 260 further includes a second compound282 being a pyrimidine derivative, a triazine derivative or ananthracene derivative. For example, the second organic layer 280 mayinclude the second compound 282. The second compound 282 is representedby one of Formula 2-1, Formula 2-2 and Formula 2-3.

In Formula 2-1, two of Ar11 to Ar13 are independently selected from asubstituted or unsubstituted C6 to C30 aryl group, and the other one ofAr11 to Ar13 is selected from the group consisting of a C6 to C30 arylgroup substituted with a substituted or unsubstituted C5 to C30heteroaryl group and a substituted or unsubstituted C5 to C30 heteroarylgroup.

In Formula 2-2, each of Ar2 and Ar22 is independently selected from asubstituted or unsubstituted C6 to C30 aryl group, and Ar23 is selectedfrom the group consisting of a C6 to C30 aryl group unsubstituted orsubstituted with a C5 to C30 heteroaryl group and a substituted orunsubstituted C5 to C30 heteroaryl group.

In Formula 2-3, each of Ar31 and Ar32 is independently selected from thegroup consisting of hydrogen, a substituted or unsubstituted C6 to C30aryl group and a substituted or unsubstituted C5 to C30 heteroarylgroup, and each of Ar33 and Ar34 is independently selected from thegroup consisting of a substituted or unsubstituted C6 to C30 aryl groupand a substituted or unsubstituted C5 to C30 heteroaryl group.

The second compound 282 may be one of the compounds in Formula 2-4.

The second organic layer 280 may further include a third compound (notshown) being a lithium (Li) derivative. For example, the Li derivativemay be the compound, lithium quinolate (Liq), in Formula 3.

The third compound may have a volume % of 10 to 200, preferably 50 to150, with respect to the second compound 282.

The first organic layer 270 has a first thickness, and the secondorganic layer 280 has a second thickness being greater than the firstthickness. For example, the first thickness may be 30 to 100 Å, and thesecond thickness may be 200 to 300 Å.

As illustrated above, the OLED D1 of the present disclosure includes theintermediate organic layer 260, which includes the first and secondorganic layers 270 and 280, between the EML 240 and the second electrode230 being the cathode, and the first organic layer 270 includes thefirst compound 272 represented by Formula 1-1. Accordingly, the turn-onvoltage and the driving voltage of the OLED D1 are decreased so that theOLED D1 and the organic light emitting display device 100 including theOLED D1 have advantages of decrease of power consumption, increase ofemitting efficiency and increase of lifespan.

In addition, since the second organic layer 280 includes the secondcompound 282 represented by one of Formulas 2-1 to 2-3, the OLED D1 andthe organic light emitting display device 100 including the OLED D1 havebig advantages of decrease of power consumption, increase of emittingefficiency and increase of lifespan.

Moreover, since the second organic layer 280 includes the third compoundbeing the Li derivative, the property of the OLED D1 and the organiclight emitting display device 100 including the OLED D1 is furtherimproved.

[OLED]

An anode (ITO), an HIL (the compound in Formula 4-1 (12 vol %) and thecompound in Formula 4-2, 100 Å), a HTL (the compound in Formula 4-2, 930Å), a EBL (the compound in Formula 4-3, 150 Å), a EML (the compound inFormula 4-4 (host) and the compound in Formula 4-5 (dopant, 3 vol %),250 Å), a HBL (60 Å), a ETL (250 Å), an EIL (Yb:LiF, 15 Å), a cathode(Ag:Mg, 145 Å) and a capping layer (the compound in Formula 4-6, 650 Å)are sequentially deposited to form an OLED.

1. Comparative Example (1) Comparative Example 1 (Ref1)

The compound E-1 in Formula 5 is used to form the HBL, and the compoundET in Formula 6 and the compound (Liq) in Formula 3 are used to form theETL. (a volume ratio (vol %), ET:Liq=1:1)

(2) Comparative Example 2 (Ref2)

The compound E-2 in Formula 5 is used to form the HBL, and the compoundET in Formula 6 and the compound (Liq) in Formula 3 are used to form theETL. (a volume ratio (vol %), ET:Liq=1:1)

(3) Comparative Example 3 (Ref3)

The compound E-3 in Formula 5 is used to form the HBL, and the compoundET in Formula 6 and the compound (Liq) in Formula 3 are used to form theETL. (a volume ratio (vol %), ET:Liq=1:1)

2. Example 1 (Ex1)

The compound A-3 in Formula 1-2 is used to form the HBL, and thecompound ET in Formula 6 and the compound (Liq) in Formula 3 are used toform the ETL. (a volume ratio (vol %), ET:Liq=1:1)

The emitting properties, i.e., the driving voltage (V), the quantumefficiency (QE), the blue index (cd/A/CIEy) and the lifespan (T95), ofthe OLED in Comparative Examples 1 to 3 and Example 1 are measured andlisted in Table 1.

Table 1

ETL cd/A/ HBL (Liq vol ratio) V QE CIEy T95 Ref1 E-1 ET (1:1) 107%  91% 89%  90% Ref2 E-2 ET (1:1) 105%  99%  97%  95% Ref3 E-3 ET (1:1) 106% 99%  97%  97% Ex1 A-3 ET (1:1) 100% 100% 100% 100%

The first compound in Formula 1-1 of the present disclosure has astructure in which a 2^(nd)-position of a pyrimidine moiety and a2^(nd)-position of a quinoline moiety directly linked to each other,while the compounds E-1, E-2 and E-3 used in the first organic layer,i.e., the HBL, of the OLED of Ref1 to Ref3 have different structure fromthe first compound of the present disclosure.

As shown in Table 1, in comparison to the OLED of Ref1 to Ref3, in theOLED of Ex1, in which the first organic layer includes the firstcompound in Formula 1-1, the driving voltage is reduced, and the quantumefficiency, the blue index and the lifespan are improved.

3. Comparative Example 4 (Ref4)

The compound HB in Formula 7 is used to form the HBL, and the compoundET in Formula 6 and the compound (Liq) in Formula 3 are used to form theETL. (a volume ratio (vol %), ET:Liq=1:1)

4. Example (1) Example 2 (Ex2)

The compound A-3 in Formula 1-2 is used to form the HBL, and thecompound ET in Formula 6 and the compound (Liq) in Formula 3 are used toform the ETL. (a volume ratio (vol %), ET:Liq=1:1)

(2) Example 3 (Ex3)

The compound A-3 in Formula 1-2 is used to form the HBL, and thecompound D-5 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), D-5:Liq=2:1)

(3) Example 4 (Ex4)

The compound A-20 in Formula 1-2 is used to form the HBL, and thecompound D-5 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), D-5:Liq=2:1)

(4) Example 5 (Ex5)

The compound A-83 in Formula 1-2 is used to form the HBL, and thecompound D-5 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), D-5:Liq=2:1)

(5) Example 6 (Ex6)

The compound A-83 in Formula 1-2 is used to form the HBL, and thecompound D-5 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), D-5:Liq=1:1)

(6) Example 7 (Ex7)

The compound A-3 in Formula 1-2 is used to form the HBL, and thecompound B-2 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), B-2:Liq=1:1)

(7) Example 8 (Ex8)

The compound A-20 in Formula 1-2 is used to form the HBL, and thecompound B-2 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), B-2:Liq=1:1)

(8) Example 9 (Ex9)

The compound A-20 in Formula 1-2 is used to form the HBL, and thecompound B-2 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), B-2:Liq=1:2)

(9) Example 10 (Ex10)

The compound A-83 in Formula 1-2 is used to form the HBL, and thecompound B-2 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), B-2:Liq=1:1)

(10) Example 11 (Ex11)

The compound A-3 in Formula 1-2 is used to form the HBL, and thecompound C-7 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), C-7:Liq=1:2)

(11) Example 12 (Ex12)

The compound A-3 in Formula 1-2 is used to form the HBL, and thecompound C-7 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), C-7:Liq=1:1)

(12) Example 13 (Ex13)

The compound A-20 in Formula 1-2 is used to form the HBL, and thecompound C-7 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), C-7:Liq=1:2)

(13) Example 14 (Ex14)

The compound A-83 in Formula 1-2 is used to form the HBL, and thecompound C-7 in Formula 2-4 and the compound (Liq) in Formula 3 are usedto form the ETL. (a volume ratio (vol %), C-7:Liq=1:2)

The emitting properties, i.e., the driving voltage (V), the luminance(cd/A), the quantum efficiency (QE), the blue index (cd/A/CIEy) and thelifespan (T95), of the OLED in Comparative Example 4 and Examples 2 to14 are measured and listed in Table 2.

TABLE 2 ETL HBL (Liq vol ratio) V cd/A QE cd/A/CIEy T95 Ref4 HB ET (1:1)100% 100% 100% 100% 100% Ex2 A-3 ET (1:1)  97% 104% 106% 106% 102% Ex3A-3 D-5 (2:1)  97% 108% 110% 113% 105% Ex4 A-20 D-5 (2:1)  86% 116% 118%119% 102% Ex5 A-83 D-5 (2:1)  86% 117% 118% 119% 100% Ex6 A-83 D-5 (1:1) 88% 118% 119% 120% 101% Ex7 A-3 B-2 (1:1)  90% 104% 107% 109% 114% Ex8A-20 B-2 (1:1)  94%  98%  96%  96% 126% Ex9 A-20 B-2 (1:2)  95%  97% 95%  95% 129% Ex10 A-83 B-2 (1:1)  94% 102% 101% 101% 111% Ex11 A-3 C-7(1:2)  95% 115% 114% 114% 101% Ex12 A-3 C-7 (1:1)  93% 112% 111% 111%100% Ex13 A-20 C-7 (1:2)  99% 103% 104% 105% 105% Ex14 A-83 C-7 (1:2) 99% 109% 107% 108%  95%

As shown in Table 2, in comparison to the OLED of Ref2, in which thefirst organic layer includes the compound in Formula 7, in the OLED ofEx2 to Ex14, in which the first organic layer includes the firstcompound in Formula 1-1, the driving voltage is reduced, and the quantumefficiency, the blue index and the lifespan are improved.

In addition, in comparison to the OLED of Ex2, in which the secondorganic layer, i.e., the ETL, includes the compound in Formula 6, in theOLED of Ex3 to Ex14, in which the second organic layer includes thecompound represented by one of Formulas 2-1 to 2-3, the driving voltageis reduced, and the quantum efficiency, the blue index and the lifespanare improved.

FIG. 4 is a schematic cross-sectional view of an OLED according to athird embodiment of the present disclosure.

As shown in FIG. 4 , an OLED D2 includes a first electrode 210, a secondelectrode 230 facing the first electrode 210 and a light emitting layer220 therebetween. The light emitting layer 220 includes a first emittingpart 310 including a first EML 318 and a first intermediate organiclayer 320 and a second emitting part 350 including a second EML 356 anda second intermediate organic layer 360. The second emitting part 350 ispositioned between the first emitting part 310 and the second electrode230. The first intermediate organic layer 320 is positioned between thefirst EML 318 and the second emitting part 350 and includes a firstorganic layer 330 and a second organic layer 340. The secondintermediate organic layer 360 is positioned between the second EML 356and the second electrode 230 and includes a first organic layer 370 anda second organic layer 380. In addition, the OLED D2 may further includea charge generation layer (CGL) 390 between the first and secondemitting parts 310 and 350.

The organic light emitting display device 100 (of FIG. 2 ) includes ared pixel region, a green pixel region and a blue pixel region, and theOLED D2 is positioned in each of the red, green and blue pixel regions.

The first electrode 210 may be an anode, and the second electrode 230may be a cathode. One of the first and second electrodes 210 and 230 isa transparent electrode (semitransparent electrode, and the other one ofthe first and second electrodes 210 and 230 is a reflective electrode.

The first emitting part 310 may further include at least one of a firstHTL 314 between the first electrode 210 and the first EML 318 and afirst EBL 316 between the first HTL 314 and the first EML 318.

In addition, the first emitting part 310 may further include an HIL 312between the first electrode 210 and the first HTL 314.

The second emitting part 350 may further include at least one of asecond HTL 352 under the second EML 356 and a second EBL 354 between thesecond EML 356 and the second HTL 352.

In addition, the second emitting part 350 may further include an EIL 358between the second intermediate organic layer 360 and the secondelectrode 230.

Each of the first and second EMLs 318 and 356 is one of a red EML, agreen EML and a blue EML. Namely, the same color light is emitted fromthe first and second emitting parts 310 and 350. For example, adifference between an emission wavelength range of the first emittingpart 310 or the first EML 318 and an emission wavelength range of thesecond emitting part 350 or the second EML 356 may be 0 to 20 nm.

The CGL 390 is positioned between the first and second emitting parts310 and 350, and the first emitting part 310, the CGL 390, the secondemitting part 350 are sequentially stacked on the first electrode 210.Namely, the first emitting part 310 is positioned between the firstelectrode 210 and the CGL 390, and the second emitting part 350 ispositioned between the second electrode 230 and the CGL 390.

The first and second emitting parts 310 and 350 are connected throughthe CGL 390. The CGL 390 may be a P-N junction CGL of an N-type CGL 392and a P-type CGL 394.

The N-type CGL 392 is positioned between the first intermediate organiclayer 320 and the second emitting part 350, and the P-type CGL 394 ispositioned between the N-type CGL 392 and the second emitting part 350.The N-type CGL 392 provides an electron to the first EML 318 of thefirst emitting part 310, and the P-type CGL 394 provides a hole to thesecond EML 356 of the second emitting part 350.

At least one of the first and second intermediate organic layers 320 and360 includes a compound represented by Formula 1-1. For example, thefirst organic layer 330 of the first intermediate organic layer 320includes a first compound 332 represented by Formula 1-1, and/or thefirst organic layer 370 of the second intermediate organic layer 360includes a first compound 372 represented by Formula 1-1.

The first organic layer 330 of the first intermediate organic layer 320may include a first compound 332 represented by Formula 1-1, and thefirst organic layer 370 of the second intermediate organic layer 360 mayinclude a first compound 372 represented by Formula 1-1. In this case,the first compound 332 included in the first organic layer 330 of thefirst intermediate organic layer 320 and the first compound 372 includedin the first organic layer 370 of the second intermediate organic layer360 may be same or different.

The second organic layer 340 of the first intermediate organic layer320, which includes the compound represented by Formula 1-1, and/or thesecond organic layer 380 of the second intermediate organic layer 360,which includes the compound represented by Formula 1-1, includes thecompound represented by one of Formulas 2-1 to 2-3.

When the first organic layer 330 of the first intermediate organic layer320 includes the first compound 332 represented by Formula 1-1, thesecond organic layer 340 of the first intermediate organic layer 320includes a second compound 342 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 340 of the firstintermediate organic layer 320 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 342.

When the first organic layer 370 of the second intermediate organiclayer 360 includes the first compound 372 represented by Formula 1-1,the second organic layer 380 of the second intermediate organic layer360 includes a second compound 382 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 380 of the secondintermediate organic layer 360 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 382.

When the first organic layer 330 of the first intermediate organic layer320 and the first organic layer 370 of the second intermediate organiclayer 360 respectively include the first compound 332 represented byFormula 1-1 and the first compound 372 represented by Formula 1-1, thesecond organic layer 340 of the first intermediate organic layer 320 andthe second organic layer 380 of the second intermediate organic layer360 respectively include the second compound 342 represented by one ofFormulas 2-1 to 2-3 and the second compound 382 represented by one ofFormulas 2-1 to 2-3. In this instance, each of the second organic layer340 of the first intermediate organic layer 320 and the second organiclayer 380 of the second intermediate organic layer 360 may furtherinclude a third compound (not shown) being a Li derivative. In thesecond organic layer 340 of the first intermediate organic layer 320,the third compound has a volume % of 10 to 200, preferably 50 to 150,with respect to the second compound 342. In the second organic layer 380of the second intermediate organic layer 360, the third compound has avolume % of 10 to 200, preferably 50 to 150, with respect to the secondcompound 382.

When the second organic layer 340 of the first intermediate organiclayer 320 and the second organic layer 380 of the second intermediateorganic layer 360 respectively include the second compound 342represented by one of Formulas 2-1 to 2-3 and the second compound 382represented by one of Formulas 2-1 to 2-3, the second compound 342included in the second organic layer 340 of the first intermediateorganic layer 320 and the second compound 382 included in the secondorganic layer 380 of the second intermediate organic layer 360 may besame or different.

In the first intermediate organic layer 320, the first organic layer 330may have a thickness being smaller than the second organic layer 340. Inthe second intermediate organic layer 360, the first organic layer 370may have a thickness being smaller than the second organic layer 380.

As illustrated above, in the OLED D2 of the present disclosure, thefirst emitting part 310 includes the first intermediate organic layer320, which is disposed on the first EML 318 and includes the first andsecond organic layers 330 and 340, and the second emitting part 350includes the second intermediate organic layer 360, which is disposed onthe second EML 356 and includes the first and second organic layers 370and 380. In this instance, at least one of the first organic layer 330in the first intermediate organic layer 320 and the first organic layer370 in the second intermediate organic layer 360 includes the firstcompound 332 and 372 represented by Formula 1-1. As a result, theturn-on voltage and the driving voltage of the OLED D2 are decreased sothat the OLED D2 and the organic light emitting display device 100including the OLED D2 have advantages of decrease of power consumption,increase of emitting efficiency and increase of lifespan.

In addition, since at least one of the second organic layer 340 in thefirst intermediate organic layer 320 and the second organic layer 380 inthe second intermediate organic layer 360 includes the second compound342 and 382 represented by one of Formulas 2-1 to 2-3, the OLED D2 andthe organic light emitting display device 100 including the OLED D2 havebig advantages of decrease of power consumption, increase of emittingefficiency and increase of lifespan.

Moreover, since at least one of the second organic layer 340 in thefirst intermediate organic layer 320 and the second organic layer 380 inthe second intermediate organic layer 360 further includes the thirdcompound being the Li derivative, the property of the OLED D2 and theorganic light emitting display device 100 including the OLED D2 isfurther improved.

Furthermore, since the OLED D2 has a tandem structure and includes theintermediate organic layers 320 and 360, the emitting efficiency of theOLED D2 and the organic light emitting display device 100 including theOLED D2 is significantly increased with preventing or minimizingincrease of the driving voltage.

FIG. 5 is a schematic cross-sectional view of an organic light emittingdisplay device according to a fourth embodiment of the presentdisclosure.

As shown in FIG. 5 , an organic light emitting display device 400includes a substrate 410, where first to third pixel regions P1, P2 andP3 are defined, a TFT Tr on or over the substrate 410, an OLED D overthe TFT Tr and connected to the TFT Tr and a color filter layer 420corresponding to the first to third pixel regions P1, P2 and P3. Forexample, the first pixel region P1 may be a red pixel region, the secondpixel region P2 may be a green pixel region, and the third pixel regionP3 may be a blue pixel region. The first to third pixel regions P1, P2and P3 constitute a pixel unit.

The substrate 410 may be a glass substrate or a flexible substrate. Forexample, the flexible substrate may be one of a polyimide (PI)substrate, a polyethersulfone (PES) substrate, a polyethylenenaphthalate(PEN) substrate, a polyethylene terephthalate (PET) substrate and apolycarbonate (PC) substrate.

The TFT Tr is positioned on the substrate 410. Alternatively, a bufferlayer (not shown) may be formed on the substrate 410, and the TFT Tr maybe formed on the buffer layer.

As illustrated with reference to FIG. 2 , the TFT Tr includes asemiconductor layer, a gate electrode, a source electrode and a drainelectrode and acts as a driving element. Namely, the TFT Tr may be thedriving TFT Td (of FIG. 1 ).

The color filter layer 420 is positioned on or over the substrate 410.For example, the color filter layer 420 may include a first color filterlayer 422 corresponding to the first pixel region P1, a second colorfilter layer 424 corresponding to the second pixel region P2 and a thirdcolor filter layer 426 corresponding to the third pixel region P3. Thefirst color filter layer 422 may be a red color filter layer, the secondcolor filter layer 424 may be a green color filter layer, and the thirdcolor filter layer 426 may be a blue color filter layer. For example,the first color filter layer 422 may include at least one of red dye andred pigment, the second color filter layer 424 may include at least oneof green dye and green pigment, and the third color filter layer 426 mayinclude at least one of blue dye and blue pigment.

A planarization layer 450 is disposed on the TFT Tr and the color filterlayer 420. The planarization layer 450 has a flat top surface andincludes a drain contact hole 452 exposing the drain electrode of theTFT Tr.

The OLED D is disposed on the planarization layer 450 and corresponds tothe color filter layer 420. The OLED D includes a first electrode 470, alight emitting layer 480 and a second electrode 490. The first electrode470 is connected to the drain electrode of the TFT Tr through the draincontact hole 452, and the light emitting layer 480 and the secondelectrode 490 are sequentially stacked on the first electrode 470. TheOLED D is positioned in each of the first to third pixel regions P1, P2and P3 and emits white color light in each of the first to third pixelregions P1, P2 and P3.

The first electrode 470 may be formed to be separated in each of thefirst to third pixel regions P1, P2 and P3, and the second electrode 490may be formed as one-body in correspondence to the first to third pixelregions P1, P2 and P3.

The first electrode 470 is one of an anode and a cathode, and the secondelectrode 490 is the other one of the anode and the cathode. The firstelectrode 470 is a transparent (or semi-transparent) electrode, andsecond electrode 490 is a reflection electrode.

For example, the first electrode 470 may be an anode and may include atransparent conductive oxide material layer formed of a conductivematerial, e.g., a transparent conductive oxide material, having arelatively high work function. The second electrode 490 may be a cathodeand may include a metallic material layer formed of a conductivematerial, e.g., low resistance metal, having a relatively low workfunction. For example, transparent conductive oxide material layer ofthe first electrode 470 may include one of indium-tin-oxide (ITO),indium-zinc-oxide (IZO), indium-tin-zinc-oxide (ITZO), tin oxide (SnO),zinc oxide (ZnO), indium-copper-oxide (ICO) and aluminum-zinc-oxide(Al:ZnO, AZO), and the second electrode 490 may be formed of aluminum(Al), magnesium (Mg), calcium (Ca), silver (Ag), their alloy, e.g.,Mg—Ag alloy (MgAg) or their combination.

The light emitting layer 480 as an emission unit is formed on the firstelectrode 470. The light emitting layer 480 includes at least twoemitting parts emitting different color lights. Each emitting partincludes an EML and an intermediate organic layer. For example, theintermediate organic layer may have a double-layered structure includinga first organic layer being an HBL and a second organic layer being anETL. In addition, each emitting part may further include at least one ofan HIL, an HTL, an EBL and an EIL. Moreover, the light emitting layer480 may further include a CGL between emitting parts.

In this instance, at least one of the intermediate organic layersincludes a first compound represented by Formula 1-1. For example, thefirst organic layer of the intermediate organic layer may include thefirst compound represented by Formula 1-1. In addition, the secondorganic layer of the intermediate organic layer may include a secondcompound represented by one of Formulas 2-1 to 2-3. Moreover, the secondorganic layer of the intermediate organic layer may further include athird compound being a Li derivative.

A bank layer 460, which covers an edge of the first electrode 470, isformed on the planarization layer 450. The bank layer 460 exposes acenter of the first electrode 470 corresponding to the first to thirdpixel regions P1, P2 and P3. As illustrate above, since the OLED D emitswhite color light at the first to third pixel regions P1, P2 and P3, thelight emitting layer 480 may be continuously formed through the first tothird pixel regions P1, P2 and P3 as a common layer. The bank layer 460is formed to prevent current leakage at an edge of the first electrode470 and may be omitted.

The organic light emitting display device 400 may further include anencapsulation film (or an encapsulation layer) formed on the secondelectrode 490 to prevent penetration of moisture into the OLED D. Inaddition, the organic light emitting display device 400 may furtherinclude a polarization plate under the substrate 410 for reducing anambient light reflection.

In the organic light emitting display device 400, the first electrode470 is a transparent electrode, the second electrode 470 is a reflectiveelectrode, and the color filter layer 420 is disposed between thesubstrate 410 and the OLED D. Namely, the organic light emitting displaydevice 400 is a bottom-emission type organic light emitting displaydevice.

Alternatively, in the organic light emitting display device 400, thefirst electrode 470 may be a reflective electrode, the second electrode470 may be a transparent electrode, and the color filter layer 420 maybe disposed on or over the OLED D.

In the organic light emitting display device 400, the OLED D in thefirst to third pixel regions P1, P2 and P3 emits white color light, andthe white color light passes through the first to third color filterlayers 422, 424 and 426. As a result, red, green and blue colors arerespectively displayed in the first to third pixel regions P1, P2 andP3.

Although not shown, a color conversion layer may be disposed between theOLED D and the color filter layer 420. The color conversion layer mayinclude a red, green and blue color conversion layers respectivelycorresponding to the first to third pixel regions P1, P2 and P3, and thewhite color light can be converted into red, green and blue color lightby the red, green and blue color conversion layers, respectively. Forexample, the color conversion layer may include a quantum dot. The colorpurity of the organic light emitting display device 400 may be furtherimproved by the color conversion layer.

In addition, the color conversion layer may be included instead of thecolor filter layer 420.

FIG. 6 is a schematic cross-sectional view of an OLED according to afifth embodiment of the present disclosure.

As shown in FIG. 6 , an OLED D3 includes a first electrode 470, a secondelectrode 490 facing the first electrode 470 and a light emitting layer480 therebetween. The light emitting layer 480 includes a first emittingpart 510 including a first EML 518 and a first intermediate organiclayer 520, a second emitting part 530 including a second EML 536 and asecond intermediate organic layer 540 and a third emitting part 550including a third EML 556 and a third intermediate organic layer 560.The second emitting part 530 is positioned between the first emittingpart 510 and the second electrode 490. The third emitting part 550 ispositioned between the second emitting part 530 and the second electrode490. The first intermediate organic layer 520 is positioned between thefirst EML 518 and the second emitting part 530 and includes a firstorganic layer 522 and a second organic layer 526. The secondintermediate organic layer 540 is positioned between the second EML 536and the third emitting part 550 and includes a first organic layer 542and a second organic layer 546. The third intermediate organic layer 560is positioned between the third EML 556 and the second electrode 490 andincludes a first organic layer 562 and a second organic layer 566. Inaddition, the OLED D3 may further include a first CGL 570 between thefirst and second emitting parts 510 and 530 and a second CGL 580 betweenthe second and third emitting parts 530 and 550.

The organic light emitting display device 400 (of FIG. 5 ) includes ared pixel region, a green pixel region and a blue pixel region, and theOLED D3 is positioned in each of the red, green and blue pixel regions.

The first electrode 470 may be an anode, and the second electrode 490may be a cathode. One of the first and second electrodes 470 and 490 isa transparent electrode (semitransparent electrode), and the other oneof the first and second electrodes 470 and 490 is a reflectiveelectrode.

The first emitting part 510 may further include at least one of a firstHTL 514 between the first electrode 470 and the first EML 518 and afirst EBL 516 between the first HTL 514 and the first EML 518.

In addition, the first emitting part 510 may further include an HIL 512between the first electrode 470 and the first HTL 514.

The second emitting part 530 may further include at least one of asecond HTL 532 under the second EML 536 and a second EBL 534 between thesecond EML 536 and the second HTL 532.

The third emitting part 550 may further include at least one of a thirdHTL 552 under the third EML 556 and a third EBL 554 between the thirdEML 556 and the third HTL 552.

In addition, the third emitting part 550 may further include an EIL 558between the third intermediate organic layer 560 and the secondelectrode 490.

One of the first to third EMLs 518, 536 and 556 is a green EML, anotherone of the first to third EMLs 518, 536 and 556 is a blue EML, and theother one of the first to third EMLs 518, 536 and 556 is a red EML.

For example, the first EML 518 may be a red EML, the second EML 536 maybe a green EML, and the third EML 556 may be a blue EML. Alternatively,the first EML 518 may be a blue EML, the second EML 536 may be a greenEML, and the third EML 556 may be a red EML.

The first CGL 570 is positioned between the first and second emittingparts 510 and 530, and the second CGL 580 is positioned between thesecond and third emitting parts 530 and 550. Namely, the first emittingpart 510, the first CGL 570, the second emitting part 530, the secondCGL 580 and the third emitting part 550 are sequentially stacked on thefirst electrode 470. In other words, the first emitting part 510 ispositioned between the first electrode 470 and the first CGL 570, andthe second emitting part 530 is positioned between the first and secondCGLs 570 and 580, and the third emitting part 550 is positioned betweenthe second electrode 490 and the second CGL 580.

The first and second emitting parts 510 and 530 are connected throughthe first CGL 570, and the second and third emitting parts 530 and 550are connected through the second CGL 580. The first CGL 570 may be afirst P-N junction CGL of a first N-type CGL 572 and a first P-type CGL574, and the second CGL 580 may be a second P-N junction CGL of a secondN-type CGL 582 and a second P-type CGL 584.

The first N-type CGL 572 is positioned between the first intermediateorganic layer 520 and the second emitting part 530, and the first P-typeCGL 574 is positioned between the first N-type CGL 572 and the secondemitting part 530. The first N-type CGL 572 provides an electron to thefirst EML 518 of the first emitting part 510, and the first P-type CGL574 provides a hole to the second EML 536 of the second emitting part530.

The second N-type CGL 582 is positioned between the second intermediateorganic layer 540 and the third emitting part 550, and the second P-typeCGL 584 is positioned between the second N-type CGL 582 and the thirdemitting part 550. The second N-type CGL 582 provides an electron to thesecond EML 536 of the second emitting part 530, and the second P-typeCGL 584 provides a hole to the third EML 556 of the third emitting part550.

At least one of the first, second and third intermediate organic layers520, 540 and 560 includes a compound represented by Formula 1-1. Forexample, at least one of a first compound 524 included in the firstorganic layer 522 of the first intermediate organic layer 520, a firstcompound 544 included in the first organic layer 542 of the secondintermediate organic layer 540 and a first compound 564 included in thefirst organic layer 562 of the third intermediate organic layer 560 isthe first compound represented by Formula 1-1.

When two or more of the first compound 524 included in the first organiclayer 522 of the first intermediate organic layer 520, the firstcompound 544 included in the first organic layer 542 of the secondintermediate organic layer 540 and the first compound 564 included inthe first organic layer 562 of the third intermediate organic layer 560are the first compound represented by Formula 1-1, the first compound524, the first compound 544 and the first compound 564 may be same ordifferent.

The second organic layer 526 of the first intermediate organic layer520, which includes the first compound represented by Formula 1-1, thesecond organic layer 546 of the second intermediate organic layer 540,which includes the first compound represented by Formula 1-1, and/or thesecond organic layer 566 of the third intermediate organic layer 560,which includes the first compound represented by Formula 1-1, includesthe second compound represented by one of Formulas 2-1 to 2-3.

When the first organic layer 522 of the first intermediate organic layer520 includes the first compound 524 represented by Formula 1-1, thesecond organic layer 526 of the first intermediate organic layer 520includes a second compound 528 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 526 of the firstintermediate organic layer 520 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 528.

When the first organic layer 542 of the second intermediate organiclayer 540 includes the first compound 544 represented by Formula 1-1,the second organic layer 546 of the second intermediate organic layer540 includes a second compound 548 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 546 of the secondintermediate organic layer 540 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 548.

When the first organic layer 562 of the third intermediate organic layer560 includes the first compound 564 represented by Formula 1-1, thesecond organic layer 566 of the third intermediate organic layer 560includes a second compound 568 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 566 of the thirdintermediate organic layer 560 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 568.

When the first organic layer 522 of the first intermediate organic layer520, the first organic layer 542 of the second intermediate organiclayer 540 and the first organic layer 562 of the third intermediateorganic layer 560 respectively include the first compound 524represented by Formula 1-1, the first compound 544 represented byFormula 1-1 and the first compound 564 represented by Formula 1-1, thesecond organic layer 526 of the first intermediate organic layer 520,the second organic layer 546 of the second intermediate organic layer540 and the second organic layer 566 of the third intermediate organiclayer 560 respectively include the second compound 528 represented byone of Formulas 2-1 to 2-3, the second compound 548 represented by oneof Formulas 2-1 to 2-3 and the second compound 568 represented by one ofFormulas 2-1 to 2-3. In this instance, each of the second organic layer526 of the first intermediate organic layer 520, the second organiclayer 546 of the second intermediate organic layer 540 and the secondorganic layer 566 of the third intermediate organic layer 560 mayfurther include a third compound (not shown) being a Li derivative. Inthe second organic layer 526 of the first intermediate organic layer520, the third compound has a volume % of 10 to 200, preferably 50 to150, with respect to the second compound 528. In the second organiclayer 546 of the second intermediate organic layer 540, the thirdcompound has a volume % of 10 to 200, preferably 50 to 150, with respectto the second compound 548. In the second organic layer 566 of the thirdintermediate organic layer 560, the third compound has a volume % of 10to 200, preferably 50 to 150, with respect to the second compound 568.

When the second organic layer 526 of the first intermediate organiclayer 520, the second organic layer 546 of the second intermediateorganic layer 540 and the second organic layer 566 of the thirdintermediate organic layer 560 respectively include the second compound528 represented by one of Formulas 2-1 to 2-3, the second compound 548represented by one of Formulas 2-1 to 2-3 and the second compound 568represented by one of Formulas 2-1 to 2-3, the second compound 528included in the second organic layer 526 of the first intermediateorganic layer 520, the second compound 548 included in the secondorganic layer 546 of the second intermediate organic layer 540 and thesecond compound 568 included in the second organic layer 566 of thethird intermediate organic layer 560 may be same or different.

In the first intermediate organic layer 520, the first organic layer 522may have a thickness being smaller than the second organic layer 526. Inthe second intermediate organic layer 540, the first organic layer 542may have a thickness being smaller than the second organic layer 546. Inthe third intermediate organic layer 560, the first organic layer 562may have a thickness being smaller than the second organic layer 566.

As illustrated above, in the OLED D3 of the present disclosure, thefirst emitting part 510 includes the first intermediate organic layer520, which is disposed on the first EML 518 and includes the first andsecond organic layers 522 and 526, the second emitting part 530 includesthe second intermediate organic layer 540, which is disposed on thesecond EML 536 and includes the first and second organic layers 542 and546, and the third emitting part 550 includes the third intermediateorganic layer 560, which is disposed on the third EML 556 and includesthe first and second organic layers 562 and 566. In this instance, atleast one of the first organic layer 522 in the first intermediateorganic layer 520, the first organic layer 542 in the secondintermediate organic layer 540 and the first organic layer 562 in thethird intermediate organic layer 560 includes the compound representedby Formula 1-1. As a result, the turn-on voltage and the driving voltageof the OLED D3 are decreased so that the OLED D3 and the organic lightemitting display device 400 including the OLED D3 have advantages ofdecrease of power consumption, increase of emitting efficiency andincrease of lifespan.

In addition, since at least one of the second organic layer 526 in thefirst intermediate organic layer 520, the second organic layer 546 inthe second intermediate organic layer 540 and the second organic layer566 in the third intermediate organic layer 560 includes the compoundrepresented by one of Formulas 2-1 to 2-3, the OLED D3 and the organiclight emitting display device 400 including the OLED D3 have bigadvantages of decrease of power consumption, increase of emittingefficiency and increase of lifespan.

Moreover, since at least one of the second organic layer 526 in thefirst intermediate organic layer 520, the second organic layer 546 inthe second intermediate organic layer 540 and the second organic layer566 in the third intermediate organic layer 560 further includes thethird compound being the Li derivative, the property of the OLED D3 andthe organic light emitting display device 400 including the OLED D3 isfurther improved.

Furthermore, since the OLED D3 has a tandem structure and includes theintermediate organic layers 520, 540 and 560, the emitting efficiency ofthe OLED D3 and the organic light emitting display device 400 includingthe OLED D3 is significantly increased with preventing or minimizingincrease of the driving voltage.

In the organic light emitting display device 400, the OLED D3 in thefirst to third pixel regions P1, P2 and P3 emits white color light, andthe white color light passes through the first to third color filterlayers 422, 424 and 426. As a result, red, green and blue colors arerespectively displayed in the first to third pixel regions P1, P2 andP3.

FIG. 7 is a schematic cross-sectional view of an OLED according to asixth embodiment of the present disclosure.

As shown in FIG. 7 , an OLED D4 includes a first electrode 470, a secondelectrode 490 facing the first electrode 470 and a light emitting layer480 therebetween. The light emitting layer 480 includes a first emittingpart 610 including a first EML 618 and a first intermediate organiclayer 620, a second emitting part 630 including a second EML 636 and asecond intermediate organic layer 640 and a third emitting part 650including a third EML 656 and a third intermediate organic layer 660.The second emitting part 530 is positioned between the first emittingpart 610 and the second electrode 490. The third emitting part 650 ispositioned between the second emitting part 630 and the second electrode490. The first intermediate organic layer 620 is positioned between thefirst EML 618 and the second emitting part 630 and includes a firstorganic layer 622 and a second organic layer 626. The secondintermediate organic layer 640 is positioned between the second EML 636and the third emitting part 630 and includes a first organic layer 642and a second organic layer 644. The third intermediate organic layer 660is positioned between the third EML 656 and the second electrode 490 andincludes a first organic layer 662 and a second organic layer 664. Inaddition, the OLED D4 may further include a first CGL 670 between thefirst and second emitting parts 610 and 630 and a second CGL 680 betweenthe second and third emitting parts 630 and 650.

The organic light emitting display device 400 (of FIG. 5 ) includes ared pixel region, a green pixel region and a blue pixel region, and theOLED D4 is positioned in each of the red, green and blue pixel regions.

The first electrode 470 may be an anode, and the second electrode 490may be a cathode. One of the first and second electrodes 470 and 490 isa transparent electrode (semitransparent electrode), and the other oneof the first and second electrodes 470 and 490 is a reflectiveelectrode.

The first emitting part 610 may further include at least one of a firstHTL 614 between the first electrode 470 and the first EML 618 and afirst EBL 616 between the first HTL 614 and the first EML 618.

In addition, the first emitting part 610 may further include an HIL 612between the first electrode 470 and the first HTL 614.

The second emitting part 630 may further include at least one of asecond HTL 632 under the second EML 636 and a second EBL 634 between thesecond EML 636 and the second HTL 632.

In the second emitting part 630, the second EML 636 includes a firstlayer 636 a, a second layer 636 b over the first layer 636 a and a thirdlayer 636 c between the first and second layers 636 a and 636 b.

The third emitting part 650 may further include at least one of a thirdHTL 652 under the third EML 656 and a third EBL 654 between the thirdEML 656 and the third HTL 552.

In addition, the third emitting part 650 may further include an EIL 658between the second intermediate organic layer 660 and the secondelectrode 490.

Each of the first and third EMLs 618 and 656 is a blue EML. In thesecond EML 636, one of the first and second layers 636 a and 636 b is ared EML, and the other one of the first and second layers 636 a and 636b is a green EML. The third layer 636 c is a yellow-green EML.Alternatively, the third layer 636 c may be omitted so that the secondEML 636 may have a double-layered structure including the first andsecond layers 636 a and 636 b.

The first CGL 670 is positioned between the first and second emittingparts 610 and 630, and the second CGL 680 is positioned between thesecond and third emitting parts 630 and 650. Namely, the first emittingpart 610, the first CGL 670, the second emitting part 630, the secondCGL 680 and the third emitting part 650 are sequentially stacked on thefirst electrode 470. In other words, the first emitting part 610 ispositioned between the first electrode 470 and the first CGL 670, andthe second emitting part 630 is positioned between the first and secondCGLs 670 and 680, and the third emitting part 650 is positioned betweenthe second electrode 490 and the second CGL 680.

The first and second emitting parts 610 and 630 are connected throughthe first CGL 670, and the second and third emitting parts 630 and 650are connected through the second CGL 680. The first CGL 670 may be afirst P-N junction CGL of a first N-type CGL 672 and a first P-type CGL674, and the second CGL 680 may be a second P-N junction CGL of a secondN-type CGL 682 and a second P-type CGL 684.

The first N-type CGL 672 is positioned between the first intermediateorganic layer 620 and the second emitting part 630, and the first P-typeCGL 674 is positioned between the first N-type CGL 672 and the secondemitting part 630. The first N-type CGL 672 provides an electron to thefirst EML 618 of the first emitting part 510, and the first P-type CGL674 provides a hole to the second EML 636 of the second emitting part630.

The second N-type CGL 682 is positioned between the second intermediateorganic layer 640 and the third emitting part 650, and the second P-typeCGL 684 is positioned between the second N-type CGL 682 and the thirdemitting part 650. The second N-type CGL 682 provides an electron to thesecond EML 636 of the second emitting part 630, and the second P-typeCGL 684 provides a hole to the third EML 656 of the third emitting part650.

At least one of the first, second and third intermediate organic layers620, 640 and 660 includes a compound represented by Formula 1-1. Forexample, at least one of a first compound 624 included in the firstorganic layer 622 of the first intermediate organic layer 620, a firstcompound 644 included in the first organic layer 642 of the secondintermediate organic layer 640 and a first compound 664 included in thefirst organic layer 662 of the third intermediate organic layer 660 isthe compound represented by Formula 1-1.

When two or more of the first compound 624 included in the first organiclayer 622 of the first intermediate organic layer 620, the firstcompound 644 included in the first organic layer 642 of the firstintermediate organic layer 640 and the first compound 664 included inthe first organic layer 662 of the third intermediate organic layer 660are the compound represented by Formula 1-1, the first compound 624, thefirst compound 644 and the first compound 664 may be same or different.

The second organic layer 626 of the first intermediate organic layer620, which includes the compound represented by Formula 1-1, the secondorganic layer 646 of the second intermediate organic layer 640, whichincludes the compound represented by Formula 1-1, and/or the secondorganic layer 666 of the third intermediate organic layer 660, whichincludes the compound represented by Formula 1-1, includes the compoundrepresented by one of Formulas 2-1 to 2-3.

When the first organic layer 622 of the first intermediate organic layer620 includes the first compound 624 represented by Formula 1-1, thesecond organic layer 626 of the first intermediate organic layer 620includes a second compound 628 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 626 of the firstintermediate organic layer 620 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 628.

When the first organic layer 642 of the second intermediate organiclayer 640 includes the first compound 644 represented by Formula 1-1,the second organic layer 646 of the second intermediate organic layer640 includes a second compound 648 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 646 of the secondintermediate organic layer 640 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 648.

When the first organic layer 662 of the third intermediate organic layer660 includes the first compound 664 represented by Formula 1-1, thesecond organic layer 666 of the third intermediate organic layer 660includes a second compound 668 represented by one of Formulas 2-1 to2-3. In this instance, the second organic layer 666 of the thirdintermediate organic layer 660 may further include a third compound (notshown) being a Li derivative. The third compound has a volume % of 10 to200, preferably 50 to 150, with respect to the second compound 668.

When the first organic layer 622 of the first intermediate organic layer620, the first organic layer 642 of the second intermediate organiclayer 640 and the first organic layer 662 of the third intermediateorganic layer 660 respectively include the first compound 624represented by Formula 1-1, the first compound 644 represented byFormula 1-1 and the first compound 664 represented by Formula 1-1, thesecond organic layer 626 of the first intermediate organic layer 620,the second organic layer 646 of the second intermediate organic layer640 and the second organic layer 666 of the third intermediate organiclayer 660 respectively include the second compound 628 represented byone of Formulas 2-1 to 2-3, the second compound 648 represented by oneof Formulas 2-1 to 2-3 and the second compound 668 represented by one ofFormulas 2-1 to 2-3. In this instance, each of the second organic layer626 of the first intermediate organic layer 620, the second organiclayer 646 of the second intermediate organic layer 640 and the secondorganic layer 666 of the third intermediate organic layer 660 mayfurther include a third compound (not shown) being a Li derivative. Inthe second organic layer 626 of the first intermediate organic layer620, the third compound has a volume % of 10 to 200, preferably 50 to150, with respect to the second compound 628. In the second organiclayer 646 of the second intermediate organic layer 640, the thirdcompound has a volume % of 10 to 200, preferably 50 to 150, with respectto the second compound 648. In the second organic layer 666 of the thirdintermediate organic layer 660, the third compound has a volume % of 10to 200, preferably 50 to 150, with respect to the second compound 668.

When the second organic layer 626 of the first intermediate organiclayer 620, the second organic layer 646 of the second intermediateorganic layer 640 and the second organic layer 666 of the thirdintermediate organic layer 660 respectively include the second compound628 represented by one of Formulas 2-1 to 2-3, the second compound 648represented by one of Formulas 2-1 to 2-3 and the second compound 668represented by one of Formulas 2-1 to 2-3, the second compound 628included in the second organic layer 626 of the first intermediateorganic layer 620, the second compound 648 included in the secondorganic layer 646 of the second intermediate organic layer 640 and thesecond compound 668 included in the second organic layer 666 of thethird intermediate organic layer 660 may be same or different.

In the first intermediate organic layer 620, the first organic layer 622may have a thickness being smaller than the second organic layer 626. Inthe second intermediate organic layer 640, the first organic layer 642may have a thickness being smaller than the second organic layer 646. Inthe third intermediate organic layer 660, the first organic layer 662may have a thickness being smaller than the second organic layer 666.

As illustrated above, in the OLED D4 of the present disclosure, thefirst emitting part 610 includes the first intermediate organic layer620, which is disposed on the first EML 618 and includes the first andsecond organic layers 622 and 626, the second emitting part 630 includesthe second intermediate organic layer 640, which is disposed on thesecond EML 636 and includes the first and second organic layers 642 and646, and the third emitting part 650 includes the third intermediateorganic layer 660, which is disposed on the third EML 656 and includesthe first and second organic layers 662 and 666. In this instance, atleast one of the first organic layer 622 in the first intermediateorganic layer 620, the first organic layer 642 in the secondintermediate organic layer 640 and the first organic layer 662 in thethird intermediate organic layer 660 includes the first compoundrepresented by Formula 1-1. As a result, the turn-on voltage and thedriving voltage of the OLED D4 are decreased so that the OLED D4 and theorganic light emitting display device 400 including the OLED D4 haveadvantages of decrease of power consumption, increase of emittingefficiency and increase of lifespan.

In addition, since at least one of the second organic layer 626 in thefirst intermediate organic layer 620, the second organic layer 646 inthe second intermediate organic layer 640 and the second organic layer666 in the third intermediate organic layer 660 includes the secondcompound represented by one of Formulas 2-1 to 2-3, the OLED D4 and theorganic light emitting display device 400 including the OLED D4 have bigadvantages of decrease of power consumption, increase of emittingefficiency and increase of lifespan.

Moreover, since at least one of the second organic layer 626 in thefirst intermediate organic layer 620, the second organic layer 646 inthe second intermediate organic layer 640 and the second organic layer666 in the third intermediate organic layer 660 further includes thethird compound being the Li derivative, the property of the OLED D4 andthe organic light emitting display device 400 including the OLED D4 isfurther improved.

Furthermore, since the OLED D4 has a tandem structure and includes theintermediate organic layers 620, 640 and 660, the emitting efficiency ofthe OLED D4 and the organic light emitting display device 400 includingthe OLED D4 is significantly increased with preventing or minimizingincrease of the driving voltage.

In the organic light emitting display device 400, the OLED D4 in thefirst to third pixel regions P1, P2 and P3 emits white color light, andthe white color light passes through the first to third color filterlayers 422, 424 and 426. As a result, red, green and blue colors arerespectively displayed in the first to third pixel regions P1, P2 andP3.

In FIG. 7 , the OLED D4 includes the first and third EMLs 618 and 656,each of which is a blue EML, and the second EML 636 so that the OLED D4has a triple-layered structure. Alternatively, one of the first andthird EMLs 618 and 656 may be omitted so that the OLED D4 may have adouble-layered structure.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the present disclosure.Thus, it is intended that the present disclosure cover the modificationsand variations of this disclosure provided they come within the scope ofthe appended claims and their equivalents.

What is claimed is:
 1. An organic light emitting diode, comprising: afirst electrode; a second electrode facing the first electrode; a firstemitting material layer between the first and second electrodes; and afirst intermediate organic layer between the first emitting materiallayer and the second electrode and including a first organic layer and asecond organic layer between the first organic layer and the secondelectrode, wherein the first organic layer includes a first compoundrepresented by Formula 1-1:

wherein each of Ar1 and Ar2 is independently selected from the groupconsisting of a substituted or unsubstituted C6 to C50 aryl group and asubstituted or unsubstituted C5 to C50 heteroaryl group, and whereineach of R1 to R6 is independently selected from the group consisting ofhydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkylgroup, a substituted or unsubstituted C6 to C30 aryl group and asubstituted or unsubstituted C5 to C30 heteroaryl group.
 2. The organiclight emitting diode according to claim 1, wherein the first compound isone of compounds in Formula 1-2:


3. The organic light emitting diode according to claim 1, wherein thesecond organic layer includes a second compound represented by one ofFormulas 2-1 to 2-3:

wherein in Formula 2-1, two of Ar11 to Ar13 are independently selectedfrom a substituted or unsubstituted C6 to C30 aryl group, and the otherone of Ar1 to Ar13 is selected from the group consisting of a C6 to C30aryl group substituted with a substituted or unsubstituted C5 to C30heteroaryl group and a substituted or unsubstituted C5 to C30 heteroarylgroup, wherein in Formula 2-2, each of Ar2 and Ar22 is independentlyselected from a substituted or unsubstituted C6 to C30 aryl group, andAr23 is selected from the group consisting of a C6 to C30 aryl groupunsubstituted or substituted with a C5 to C30 heteroaryl group and asubstituted or unsubstituted C5 to C30 heteroaryl group, and wherein inFormula 2-3, each of Ar31 and Ar32 is independently selected from thegroup consisting of hydrogen, a substituted or unsubstituted C6 to C30aryl group and a substituted or unsubstituted C5 to C30 heteroarylgroup, and each of Ar33 and Ar34 is independently selected from thegroup consisting of a substituted or unsubstituted C6 to C30 aryl groupand a substituted or unsubstituted C5 to C30 heteroaryl group.
 4. Theorganic light emitting diode according to claim 3, wherein the secondcompound is one of compounds in Formula 2-4:


5. The organic light emitting diode according to claim 3, wherein thesecond organic layer further includes a third compound being a Liderivative.
 6. The organic light emitting diode according to claim 5,wherein the third compound has a volume % of 10 to 200 with respect tothe second compound.
 7. The organic light emitting diode according toclaim 1, further comprising: a second emitting material layer betweenthe first intermediate organic layer and the second electrode; and asecond intermediate organic layer between the second emitting materiallayer and the second electrode and including a third organic layer and afourth organic layer between the third organic layer and secondelectrode, wherein the third organic layer includes a fourth compoundrepresented by Formula 1-1.
 8. The organic light emitting diodeaccording to claim 7, wherein the fourth organic layer includes a fifthcompound represented by one of Formulas 2-1 to 2-3.
 9. The organic lightemitting diode according to claim 8, wherein the fourth organic layerfurther includes a sixth compound being a Li derivative.
 10. The organiclight emitting diode according to claim 9, wherein the sixth compoundhas a volume % of 10 to 200 with respect to the fifth compound.
 11. Theorganic light emitting diode according to claim 7, wherein a differencebetween an emission wavelength range of the first emitting materiallayer and an emission wavelength range of the second emitting materiallayer is 0 to 20 nm.
 12. The organic light emitting diode according toclaim 7, wherein one of the first and second emitting material layers isa blue emitting material layer, and the other one of the first andsecond emitting material layers includes a red emitting material layerand a green emitting material layer.
 13. The organic light emittingdiode according to claim 7, further comprising: a third emittingmaterial layer between the second intermediate organic layer and thesecond electrode; and a third intermediate organic layer between thethird emitting material layer and the second electrode and including afifth organic layer and a sixth organic layer between the fifth organiclayer and second electrode, wherein the fifth organic layer includes aseventh compound represented by Formula 1-1.
 14. The organic lightemitting diode according to claim 13, wherein the sixth organic layerincludes an eighth compound represented by one of Formulas 2-1 to 2-3.15. The organic light emitting diode according to claim 14, wherein thesixth organic layer further includes a ninth compound being a Liderivative.
 16. The organic light emitting diode according to claim 15,wherein the ninth compound has a volume % of 10 to 200 with respect tothe eighth compound.
 17. The organic light emitting diode according toclaim 13, wherein one of the first to third emitting material layer is ared emitting material layer, and another one of the first to thirdemitting material layer is a green emitting material layer, and whereinthe other one of the first to third emitting material layer is a blueemitting material layer.
 18. The organic light emitting diode accordingto claim 13, wherein two of the first to third emitting material layeris a blue emitting material layer, and the other one of the first tothird emitting material layer includes a red emitting material layer anda green emitting material layer.
 19. An organic light emitting device,comprising: a substrate; and an organic light emitting diode positionedover the substrate, the organic light emitting diode including: a firstelectrode; a second electrode facing the first electrode; a firstemitting material layer between the first and second electrodes; and afirst intermediate organic layer between the first emitting materiallayer and the second electrode and including a first organic layer and asecond organic layer between the first organic layer and the secondelectrode, wherein the first organic layer includes a first compoundrepresented by Formula 1-1:

wherein each of Ar1 and Ar2 is independently selected from the groupconsisting of a substituted or unsubstituted C6 to C50 aryl group and asubstituted or unsubstituted C5 to C50 heteroaryl group, and whereineach of R1 to R6 is independently selected from the group consisting ofhydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkylgroup, a substituted or unsubstituted C6 to C30 aryl group and asubstituted or unsubstituted C5 to C30 heteroaryl group.
 20. The organiclight emitting device according to claim 19, further comprising: a colorfilter layer between the substrate and the organic light emitting diodeor over the organic light emitting diode, wherein a red pixel region, agreen pixel region and a blue pixel region are defined on the substrate,wherein the organic light emitting diode corresponds to each of the red,green and blue pixel region, and wherein the color filter layercorresponds to each of the red, green and blue pixel region.